As complete outside to this thread observing from the far:
I don't understand Hans approach here.
I looks to me that here we have Miguel with a reproducible case where a
an infinite loop inside libusb can be triggered by disturbing the USB
communication externally without touching the code in any shape or form.
Miguel has demonstrated, at least to his own satisfaction, that the buffers
involved are ok by using a memmove on them.
Further he has looked at the kernel code and found out that a buffer
over run can also cause EFAULT and if I understood correctly, that
a wrong data length could be a possible cause. And if I understood
correctly this wrong length cannot come from his code but comes
from kernel or libusb.
Thus it looks to me that in this kind of scenario it is definitely wrong
if libusb call hangs because of a transfer error.
So why not either accept that there is a logic problem in libusb
in that it can hang (regardless of weather it actually is EFAULT or not)
or that Miguel has some problem in which case try help him to resolve
that?
In short, I'm getting the impression that Miguel is right here...
cheers Kusti
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